I think if it makes you happy go for it
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I however, am in a DDD right now (when I'm at my "happy" weight I'm a D) lol. I've always been big chested. I have to layer 2-3 sportsbras when I workout, they've never been super perky, although they aren't terrible.. yet.
I'd love to be a small D or a big C. I do like my boobs.. I like the shape they give me, but I don't like the attention from guys where all they have to talk about is how big they are. So rude!
And ditto to whoever said the thing about dresses. It's TERRIBLE. When I bought my wedding dress I had to get it 4 sizes bigger to fit my chest, so un fun!